Programme

P.36 -- Posters, VCTP-50

Date: Tuesday, 5 August 2025

Time: 08:30 - 10:00

Dynamical Optical Absorption of a Monolayer Graphene inside an Empty Optical Microcavities

Le Tri Dat (1,2), Nguyen Duy Vy (3,4), Vinh N.T. Pham (5,6)

(1) Engineering Research Group, Dong Nai Technology University, Bien Hoa City, Vietnam; (2) Faculty of Engineering, Dong Nai Technology University, Bien Hoa City, Vietnam; (3) Laboratory of Applied Physics, Science and Technology Advanced Institute, Van Lang University, Ho Chi Minh City, Vietnam; (4) Faculty of Applied Technology, School of Technology, Van Lang University, Ho Chi Minh City, Vietnam; (5) Postgraduate Studies Office, Ho Chi Minh city University of Education, Ho Chi Minh city, Vietnam; (6) Department of Physics, Ho Chi Minh city University of Education, Ho Chi Minh city, Vietnam

The optical absorption on the graphene monolayer is usually examined using the static conductivity [1, 2]. In this study, using the dynamical conductivity, we examine in detail the absorption of the graphene layer inserted inside in empty optical microcavity. The optical conductivity of monolayer graphene is modeled using the Kubo formalism. Our results show that the optical force can increase several tens of time of magnitude in comparison to that in the case without the cacity. Espacially, the optical absorption could be effectively tuned by varying the graphene's position within the cavity and the cavity length, i.e. the distance between the two reflective mirrors. These findings not only advance the understanding of light–matter interaction in hybrid photonic systems but also optimize the design and performance of graphene-based optical devices. References: [1] C.M. Hoang, T. Iida, L.T. Dat, H.T. Huy, N.D. Vy, Optimal coating thickness for enhancement of optical effects in optical multilayer-based metrologies, Optics Communications 403, 150–154 (2017). [2] N.D. Vy, N.D. Chinh, L.T. Dat, Vinh N.T. Pham, Significant enhancement of optical absorption of graphene inside a metallic optical microcavity, Optics Communications 566, 130658 (2024).

Presenter: Pham Nguyen Thanh Vinh